Height Function Interface Reconstruction
Algorithm For The Simulation Of Boiling Flows
Author(s)
M. Magnini & B. Pulvirenti
Abstract
In this paper we present our results on numerical study of vapor bubbles growing in
quiescent superheated liquid, as effect of liquid evaporation at the interface. Height
Function interface reconstruction algorithm is coupled with an evaporation model
based on continuum field representation of source terms. The flow solver is a finitevolume
CFD code. Interface is tracked within a Volume-Of-Fluid framework.
Continuum-Surface-Force method accounts for surface tension effects. Vapor
bubble heat-transfer-controlled growth is simulated for three different working
fluids: water, HFE-7100 and R134a. Accuracy of interface reconstruction
algorithm is of maximum importance. Unbalance between pressure gradients
and surface tension forces at interface leads to the growth of an unphysical
velocity field which switches original only diffusive heat transfer mechanism
to combined diffusive-convective one. Height Function algorithm reduces the
magnitude of this unreal velocity field. Standard test cases are considered to assess
the performances of implemented version, through comparison with the widely
used Youngs algorithm.
Keywords: volume of fluid, height function, evaporation, surface tension, bubbles.
1 Introduction
Modern numerical implementation of surface tension driven flows, with phase
change, begins with the work of Juric and Tryggvason [1]. Earlier methods used
a Lagrangian approach with a moving mesh following the interface. The limit
of these methods was that they could not manage large interface deformation.
Juric and Tryggvason developed a Front Tracking algorithm where Lagrangian
evolution of interface is tracked on a fixed grid. Welch and Wilson [2] and Son
Keywords
volume of fluid, height function, evaporation, surface tension, bubbles
Related Book
Other papers in this volume
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